報告書番号

E380007

タイトル（和文）

DYNAMIC STRENGTH AND DEFORMATION CHARACTERISTICS OF SOIL MATERIALS CONSIDERING PERMANENT DEFORMATION UNDER CYCLIC LOADING

タイトル（英文）

DYNAMIC STRENGTH AND DEFORMATION CHARACTERISTICS OF SOIL MATERIALS CONSIDERING PERMANENT DEFORMATION UNDER CYCLIC LOADING

概要 （図表や脚注は「報告書全文」に掲載しております）

＊

概要 （英文）

THE IMPORTANT STRUCTURES REPRESENTED BY THE NUCLEAR POWER PLANTS HAVE CURRENTLY BEEN CONSTRUCTED ON OR UNDER HARD AND SOFT ROCK MASSES.HOWEVER,IT MAY BE EXPECTED,IN THE NEAR FUTURE,THAT THE SECURITY OF SITE FOR THESE STRUCTURES WILL GRADUALLY BECOME DIFFICULT BECAUSE OF THE LACK OF GOOD SITE.THEREFORE,FEASIBILITY STUDIES SHOULD BE SERIOUSLY PROMOTED FOR THE CONSTRUCTION OF THESE STRUCTURES ON THECOMPARATIVELY SOFT GROUND FORMED BY THE DILUVIAL SOILS.IN THIS CASE,ITIS ONE OFTHE VERY IMPORTANT SUBJECTS THAT ESTABLISH THE INVESTIGATION METHOD FOR THE STABILITY OF THE FOUNDATION GROUND AT STRONG EARTHQUAKE.THEN,IT IS NECESSARY TO COMPREHEND THE MECHANICAL PROPERTIES OF SOILS.BUT THERE ARE MENY UNKNOWN FACTORS ABOUT THE MATERIAL PROPERTIES AT THE VICINITY OF FAILURE UNDER CYCLIC LOADING,IN PARTICULAR,FOR THE DILUVIALSOILS SHOWING THE COMPLICATED STRENGTH-DEFORMATION CHARACTERISTICS BECAUSE OF THE CEMENTATION AMONG THE PARTICLES,STRESS HISTORY ACCEPTED IN THE PAST,AND SO ON. THIS REPORT DESCRIBES ON THE RESULTS ON THE EXPERIMENTAL AND THEORETICAL STUDIES ON THE SATURATED SAND HAVING A VARIETY OFCONSOLIDATION HISTORY.THE RESEARCH ON THE DYNAMIC DEFORMATION BEHAVIOUR HAS BEEN CODUCTED USING THE CYCLIC TRIAXIAL APPARATUS AND WE HAVE DISCUSSED ON THE CUMULATIVE PHENOMENON OF EXCESS PORE WATER PRESSURE AND STRAIN UNDER UNDRAINED CYCLIC LOADING.OBTAINED SOME CONCLUSIONS ARE AS FOLLOWS. (1)WE HAVE CLARIFIED THE YIELDING PROPERTIES OF THE SATURATED SAND UNDER NORMALLY AND OVER-CONSOLIDATED STATES FROM THE RESULTS OF THECYCLIC TRIAXIAL TESTS. (2)WE HAVE PROPOSED THE NEW ELASTO-PLASTICITY MODEL UNDER UNDRAINED CYCLIC LOADING,WHICH HAS BASED ON THE SOME EXPERIMENTAL FACTS ON THE YIELDING CHARACTERISTICS. (3)IT HAS BEEN SHOWN THAT THE PROPOSED MODEL CAN SUFFICIENTLY ESTIMATE THE UNDRAINED DEFORMATION BEHAVIOUR OF THE SATURATED SAND HAVING ANY STRESS HISTORY.

報告者

キーワード